编辑：代码已更新为正确格式。感谢所有帮助我解决这个问题的人。感谢您查看这个问题。我在社区学院的 Java 编程课上，我的教授上传了一个 Java 程序的 .pdf 文档，供我们复制并输入到 IDE 中。她实际上只是希望我们自己将它输入到 IDE 中，并在我们的期中考试中将其交上 5 分。问题是，我发现她的代码存在一些问题，无法运行（或者我可能只是不知道如何正确使用它。我不想显得浮夸）。程序中有一行代码要验证程序的carType。如下： carType = validateCarType(carType);当我尝试运行该程序时，它说：CarWash.java:69: error: cannot find symbol我第一次在自己输入时认为可能是我输入错误，然后我从 PDF 文档中复制/粘贴。没运气。该命令将如何使用？我应该声明什么吗？如果你能告诉我它是如何使用的并包括解释，我将不胜感激。我目前正在从事一个附带项目，其中包含我从 Java 中学到的东西，该项目将计算我需要从 1099 独立承包工作中节省的税款，我想了解这一点，以防万一我需要使用它。我确实检查了我的教科书，但在任何地方都没有看到这种验证方法。它们主要是 while 和 for 循环。非常感激！
2 回答
PIPIONE
TA贡献1829条经验 获得超9个赞
您必须在类中添加 validateCarType 方法。您的类中没有定义任何方法。把这个方法放在你的班级里。
private static char validateCarType(char carType) {
//here is your code
return '0';
}
有一些拼写错误。改变
double extraPricec = 0.0;
到
double extraPrice = 0.0;
并在“G”案例后添加一个中断。
case 'G':
extraPrice = 12.90;
break;// that was missing
当你再次调用函数拼写错误时
printLineofChars('*', 60);//O is in uppercase
到
printLineOfChars('*', 60);
下面的代码在我的 IDE 中运行良好：
import java.util.Scanner;
public class CarWash {
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
String name = " ";
String runProgram = " ";
int washType = 0;
char carType = ' ';
char extras = ' ';
double basicPrice = 0.0;
double adder = 0.0;
double extraPrice = 0.0;
double totalPrice = 0.0;
final double SHINE_PRICE = 4.95;
final double MAT_PRICE = 8.95;
final double CWAX = 7.95;
System.out.println("Welcome to the Car Wsh");
System.out.println("Enter Yes to start the program or No to quit.");
runProgram = keyboard.nextLine();
runProgram = runProgram.toLowerCase();
while (runProgram.equals("yes"))
{
//Getting user input
System.out.println("Please enter your name");
name = keyboard.nextLine();
System.out.println("Please choose the type of car wash:");
System.out.println("1. Pleasant Colony - sedan $34.95 SUV $35.95");
System.out.println("2. Secretariat - sedan $24.95 SUV $25.95");
System.out.println("3. Gallant Fox - sedan $19.95 SUV $20.95");
System.out.println("4. Pony Express - sedan $14.95 SUV $15.95");
System.out.println("5. Win - $12.95");
System.out.println("6. Show - $8.95");
washType = keyboard.nextInt();
keyboard.nextLine();
//Input validation loop for washType
while (washType < 1 || washType > 6) //this works
//while (washType != 1 && washType !=2 && washType !=3 && washType !=4 && washType !=5 && washType != 6)//This works
{
System.out.println("Invalid data.");
System.out.println("Please enter a value from 1 to 6.");
washType = keyboard.nextInt();
keyboard.nextLine();
}//end washType while
System.out.println("Please enter a S for Sedan or V for SUV.");
carType = keyboard.nextLine().charAt(0);
carType = Character.toUpperCase(carType);
//validation method for carType
validateCarType(carType);
//below presents 2 different menus to the user for extras
if (washType == 1 || washType == 2)
{
System.out.println("Please choose the extras:");
System.out.println("A. No Extras $0.00");
System.out.println("B. Mat Shampoo $8.95");
System.out.println("C. Carnauba Wax $7.95");
System.out.println("D. Both Mat Shampoo and Carnauba Wax $16.90"); //On the BB document, you put E, so I changed it to D
}//end washType if
else
{
System.out.println("Please choose the extras:");
System.out.println("A. No Extras $0.00");
System.out.println("B. Mat Shampoo $8.95");
System.out.println("C. Carnauba Wax $7.95");
System.out.println("D. Tire Shine $4.95");
System.out.println("E. Both Mat Shampoo and Carnauba Wax $16.90");
System.out.println("F. Both Mat Shampoo and tire Shine $13.90");
System.out.println("G. Both Carnauba Wax and Tire Shine $12.90");
System.out.println("H. All: Mat Shampoo and Carnauba Wax and Tire Shine $21.85");
}//end else
extras = keyboard.nextLine().charAt(0);
extras = Character.toUpperCase(extras);
//Validation loop for extras
while (extras != 'A' && extras != 'B' && extras != 'C' && extras != 'D' && extras != 'E' && extras != 'F' && extras != 'G' && extras != 'H') //This works
{
System.out.println("Invalid data.");
System.out.println("Please enter either A, B, C, D, E, F, G, or H.");
extras = keyboard.nextLine().charAt(0);
extras = Character.toUpperCase(extras);
}//end Invalid extras while
//determines basicPrice based on washType
basicPrice = setBasicPrice(washType);
//determines adder based on carType
adder = setAdderPrice(carType);
//determines extraPrice based on extras
switch (extras)
{
case 'A':
extraPrice = 0.0;
break;
case 'B':
extraPrice = MAT_PRICE; //extraPrice = 8.95;
break;
case 'C':
extraPrice = CWAX; //extraPrice = 7.95;
break;
case 'D':
extraPrice = SHINE_PRICE;
break;
case 'E':
extraPrice = 16.90;
break;
case 'F':
extraPrice = 13.90;
break;
case 'G':
extraPrice = 12.90;
case 'H':
extraPrice = 21.85;
break;
default:
extraPrice = 0.0;
break;
}//end extras switch
//method to calculate totalPrice
totalPrice = calcTotalPrice(basicPrice, adder, extraPrice);
//method to print a horizontal line of characters
printLineOfChars('*', 60);
//method to display results
displayResults(name, washType, carType, basicPrice, adder, extraPrice, totalPrice);
//method to print a horizontal line of characters
printLineOfChars('*', 60);
//give the user a chance to run the program again or quit
System.out.println("Please enter Yes to run the program again or No to quit.");
runProgram = keyboard.nextLine();
runProgram = runProgram.toLowerCase();
}//end runProgram while
System.out.println("Thanks for using the Car Wash Program.");
}//end main
private static void validateCarType(char carType) {
}
//calctotalPrice method calculates the total price
public static double calcTotalPrice(double myBasicPrice, double myAdder, double myExtraPrice)
{
double myTotalPrice = 0.0;
myTotalPrice = myBasicPrice + myAdder + myExtraPrice;
return myTotalPrice;
}//end double calcTotalPrice() method
//printLineOfChars method prints a horizozntal line of chars
public static void printLineOfChars(char myCharacter, int myLoopCounter)
{
for (int i = 0; i <= myLoopCounter; i++)
{
System.out.print(myCharacter);
}//end for
System.out.println();
}//end printLineOfChars()
public static void displayResults(String myName, int myWashType, char myCarType, double myBasicPrice, double myAdder, double myExtraPrice, double myTotalPrice)
{
//display results
System.out.printf("%-35s%10s\n", "Customer Name", myName);
System.out.printf("%-35s%10s\n", "Car Wash Chosen", myWashType);
System.out.printf("%-35s%10s\n", "Car Type", myCarType);
System.out.printf("%-35s%10.2f\n", "Basic Price: ", myBasicPrice);
System.out.printf("%-35s%10.2f\n", "Adder: ", myAdder);
System.out.printf("%-35s%10.2f\n", "Extras: ", myExtraPrice);
System.out.printf("%-35s%10.2f\n", "Total Price: ", myTotalPrice);
}//end displayresults() method
//setAdderPrice method calculates the adder
public static double setAdderPrice(char myCarType)
{
double myAdder = 0.0;
if (myCarType == 'S')
{
myAdder = 0.00;
}//end if
else
{
myAdder = 1.00;
}//end else
return myAdder;
}//end setAdderPrice() method
//setBasicPrice method sets the basic price based on washType
public static double setBasicPrice(int myWashType)
{
double myBasicPrice = 0.0;
switch (myWashType)
{
case 1:
myBasicPrice = 34.95;
break;
case 2:
myBasicPrice = 24.95;
break;
case 3:
myBasicPrice = 19.95;
break;
case 4:
myBasicPrice = 14.95;
break;
case 5:
myBasicPrice = 12.95;
break;
case 6:
myBasicPrice = 8.95;
break;
default:
myBasicPrice = 0.0;
}//end Swtich (myWashType)
return myBasicPrice;
}//end setBasicPrice() method
}
这是我运行这个程序时的输出：
Welcome to the Car Wsh
Enter Yes to start the program or No to quit.
yes
Please enter your name
khalid
Please choose the type of car wash:
1. Pleasant Colony - sedan $34.95 SUV $35.95
2. Secretariat - sedan $24.95 SUV $25.95
3. Gallant Fox - sedan $19.95 SUV $20.95
4. Pony Express - sedan $14.95 SUV $15.95
5. Win - $12.95
6. Show - $8.95
1
Please enter a S for Sedan or V for SUV.
S
Please choose the extras:
A. No Extras $0.00
B. Mat Shampoo $8.95
C. Carnauba Wax $7.95
D. Both Mat Shampoo and Carnauba Wax $16.90
A
*************************************************************
Customer Name khalid
Car Wash Chosen 1
Car Type S
Basic Price: 34.95
Adder: 0.00
Extras: 0.00
Total Price: 34.95
*************************************************************
Please enter Yes to run the program again or No to quit.
波斯汪
TA贡献1811条经验 获得超4个赞
您是正确的，源代码中缺少该方法。如果我不得不猜测，该方法的意图是它应该模仿前面的 while 循环，该循环反复询问washType，直到输入有效值。
在上述假设下，您可以自己实现该方法，正如其他一些人已经建议的那样，或者您可以只注释掉该行，它仍然应该运行。carType 变量传递给 setAdderPrice 方法，如果传递的类型无效，该方法将默认为 SUV 的值。
编辑： 我看到您已经将方法签名更新为具有 char 的返回类型并使您的循环正常工作。我要提出的唯一额外建议是将您现有的扫描仪传递给该函数，而不是创建一个新的扫描仪。
//validation method for carType
carType = validateCarType(carType, keyboard);
和
//validateCarType method validates the car type as either S or V
public static char validateCarType(char myCarType, Scanner scanner)
{
while (myCarType != 'S' && myCarType != 'V')
{
System.out.println("Invalid data.");
System.out.println("Please enter S for Sedan or V for SUV");
myCarType = scanner.nextLine().charAt(0);
myCarType = Character.toUpperCase(myCarType);
}
return myCarType;
}//end of validateCarType
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